Monotonic Time

• Use Erlang’s monotonic_time for timing, since it isn’t affected by OS clock changes.

System.monotonic_time/1 Returns the current monotonic time in the given time unit. The time is monotonically increasing and starts in an unspecified point in time.

start_time = System.monotonic_time(:microseconds)
 
# do something
 
end_time = System.monotonic_time(:microseconds)
 
duration_in_microseconds = end_time - start_time